-18.39% is the change from 397 to 324
Calculation steps:
[( 324 - 397 ) ÷ 397] x 100 = -18.39%
Formula
Percentage change = [(324 - 397) / 397] x 100
Subtract the new number by the original number
324 - 397 = -73
-73 ÷ 397 = -0.18387909319899245
-0.18387909319899245 x 100 = -18.39%